KR20080035937A - Structure for joining multi-pipe using electric fusion and method for constructing thereby - Google Patents

Abstract

A joint structure of multi-pipes using electric fusion and a method of constructing the same are provided to improve airtightness and watertightness at the joint portion of the pipes by installing a support member between the inner pipe and the outer pipe. A joint structure of multi-pipes(100) using electric fusion comprises a support member(300), an electric fusion member(400) and an electricity supply member. The support member is provided between an inner pipe(110) and an outer pipe(130) at the joint portion of the pipes. The electric fusion member is in contact with the support member and the outer pipe, surrounding the joint portion. The electricity supply member supplies electricity to the electric fusion member to connect the joint portion.

Description

Structure for joining multi-pipe using electric fusion and method for constructing thereby

1 is a perspective view showing a general double heat insulation tube.

Figure 2 is a perspective view showing a connection structure of multiple pipes according to an embodiment of the present invention.

Figure 3 is a plan view showing a cross section of the connection structure of a multi-pipe according to an embodiment of the present invention.

Figure 4 is a front view showing a cross section of the connection structure of a multi-pipe according to an embodiment of the present invention.

Figure 5 is a side view showing a cross-section of the connection structure of multiple pipes according to an embodiment of the present invention.

Figure 6 is a perspective view of the electrical supply member in the connection structure of multiple pipes according to an embodiment of the present invention.

Figure 7 is a perspective view showing an auxiliary band in the connection structure of multiple pipes according to an embodiment of the present invention.

Figure 8 is a perspective view of the clamp in the connection structure of multiple pipes according to an embodiment of the present invention.

9 is a perspective view showing a spacer that is a main part of a connection structure of a multi-pipe according to an embodiment of the present invention;

10 is a perspective view showing a supporter which is a main part of a connection structure of a multi-pipe according to an embodiment of the present invention;

Figure 11 is a perspective view showing the shape of the spacer and the supporter coupled to the main portion of the connection structure of the multi-pipe according to an embodiment of the present invention.

Figure 12 is a side view showing that the supporting member which is the main part of the connection structure of the multi-pipe according to one embodiment of the present invention is formed integrally.

Figure 13 is a perspective view showing an electric fusion member that is the main part of the connection structure of a multi-pipe according to an embodiment of the present invention.

Figure 14 is a perspective view showing a clamp fastened to the auxiliary band in the connection structure of a multi-pipe according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: multiple piping 110: inner tube

130: appearance 200: connecting portion

300: support member 310: spacer

320: supporter 400: electric fusion member

410: electrofusion sheet 420: terminal portion

430: hot wire portion 500: electrical supply member

610: auxiliary band 620: clamp

The present invention is a multi-pipe connection structure and construction method using the electric fusion to improve the accessibility and reduce the maintenance cost while simplifying the operation by using the electric fusion when connecting multiple pipes, especially double insulation pipes and similar pipes It is about.

In general, in the industrial field, various fluids (liquid or gas) for various uses are supplied and used, and pipes capable of supplying such various fluids are used. In addition, a double pre-insulated pipe is used as a local air-conditioning pipe, hot spring water transfer pipe, cryogenic refrigerant pipe, steam pipe, or fire pipe.

1 is a perspective view showing a general double heat insulation tube.

As shown in FIG. 1, the double heat insulating tube 10 is formed of a carrier pipe 20, a heat insulating material 30, and a jacket 40. In addition, the individual pipes (that is, the double thermal insulation pipes 10) standardized or standardized at the plumbing work or maintenance site for the above-described regional heating and cooling pipes are used, and the conventional connection method of the double thermal insulation pipes is There are two general categories.

One is a mechanical connection method using a sleeve which is a metal case, and the other is a welding method using a heat shrinkage material or the like. The connection method using the metal case is a method of mechanically connecting the double insulation tube using a sleeve and a joint fastener of the metal material. However, this method is not only structurally weak to corrosion but also vulnerable to external shock and vibration. Therefore, after construction to connect the connection of the pipe should have a durability of at least several decades, the connection method using a sleeve, which is a conventional metal case causes damage to the connection of the pipe due to the above-described problems, etc. There is a problem in that water leakage and leakage occurs at the connection portion of the pipe 20, thereby causing a decrease in airtightness and watertightness.

Therefore, instead of the pipe connection method using the sleeve which is the metal case mentioned above, the welding method using a heat shrinkage material etc. is used at the time of pipe connection construction. In the pipe welding method using the heat shrinkage material, etc., the inner pipe 20 is connected, and the heat shrinkage material and the adhesive material are wrapped by the torch spark after the heat shrinkage material is wrapped on the surface of the appearance 40 in each pipe 10. It is a method of melting and attaching to the surface of 40) for welding. However, such a pipe connection method also has many problems.

That is, when the connection portion of the pipe 10 is connected, complete sealing and connection must be performed to maintain the airtightness and watertightness of the connection portion. However, the longitudinal section, which is a part which is in contact with the heat shrinkage member or the surface 40 of the sheet or the exterior, may be in close contact with the torch and may be completely attached. However, due to the structure as shown in FIG. Since a space is formed between the exterior 40 and the inner tube 20, the lower part of the heat shrink sheet is left as an empty space, thereby making it difficult to completely attach it.

In addition, the conventional welding method using the heat shrink material is welded by melting with a torch flame after inserting an adhesive sheet such as a master tape between the surface of the exterior 40 and the heat shrink material or sheet to improve the connection. However, in this case, since the adhesive sheet serves as an adhesive, the adhesive sheet is made of a material different from the exterior 40 and the heat shrinkable material. Accordingly, the connection parts of the pipes, which should be guaranteed for at least several decades, are separated from each other after several years due to the appearance 40 and the adhesive sheet of the heat-shrinkable material and different materials, causing leakage and leakage. The problem is that the double insulation tube is corroded.

In the connecting method of the pipe 10, a welding method using a heat shrinkage material or a sheet is a method of connecting the connecting portion of the pipe 10 by a torch spark as described above. However, this not only has a problem that an impact caused by fire may be applied to the connection portion of the pipe 10 during construction, and may cause damage to the connection portion by the fire, and there is a fear that a fire may occur during operation. There is also.

In addition, most of these welding methods dissolve the heat shrink material and the adhesive material with the torch flame and attach it to the connection part of the pipe. For this purpose, the heat shrink material and the adhesive material must be heated around the heat shrink material evenly. Otherwise, it will not only cause a problem in adhesion but also cause uneven construction, which will lead to a change in physical properties in the long term due to increased carbonization and fatigue of the heat shrinkable material and appearance, thereby shortening the life of the product. There is a problem that must be done only by. Therefore, in the construction of large-sized pipes or the connection of double heat insulation pipes, unskilled technicians cannot be uniformly constructed, resulting in a decrease in productivity.

Therefore, the present invention is simple to use the electric fusion member and the support member when connecting multiple pipes, in particular double insulation pipes and similar pipes, while completely sealing the connection of the pipe connection to prevent leakage and leakage due to poor connection Provides a multi-pipe connection structure and construction method using the electrofusion possible.

In addition, the present invention by eliminating the impact of the fire caused by the conventional construction and damage to the connection portion of the pipe by the source at the same time to increase the robustness of the multi-pipe, that is, the double insulation pipe, reducing maintenance costs and product life Provides a multi-pipe connection structure and construction method using an electric fusion that can be extended.

The present invention provides a structure for connecting the multiple pipes including the inner pipe and the inner pipe to which the fluid is supplied and the outer pipe, the support pipe is provided in the space between the inner pipe and the exterior at the connection portion of the multiple pipe; An electric fusion member in contact with the support member and the exterior and surrounding a connection portion of the multiple pipe; And it provides a connection structure of a multi-pipe including an electric supply member for supplying electricity to the fusion member to connect the connection portion of the multi-pipe.

In addition, the connection structure of the multi-pipe according to the present invention may further include a fastening member for the electrofusion member to be fixed by pressing the connection portion of the multi-pipe.

The support member may be in a support shape in contact with the inner side of the electric fusion member and support the electric fusion member. In addition, the support member is provided on the outer side of the inner tube at the connection portion of the multi-pipe ring-shaped spacer formed with a projection on the outer surface; And a bar type supporter provided at an outer side of the spacer and an inner side of the electric fusion member and having a groove portion corresponding to the protrusion at an inner surface thereof, or the spacer and the supporter may be integrally formed.

The electro-fusion member is a sheet of an open shape, one end and the other end is connected to surround a certain portion of one appearance and the other appearance at the connection portion of the multi-pipe, the terminal portion provided on both sides of the sheet, and the heating wire portion provided in the sheet Include. The material of the electrofusion member is made to correspond to the material of the appearance. In addition, when the connection portion of the multiple pipe is inclined, it may further comprise filling the powder or resin material corresponding to the material of the electrofusion sheet and the appearance between the surface of the electrofusion sheet and the appearance.

The electric supply member may be made of an electric fusion machine or a resistor for supplying electricity to both terminals of the electric fusion member to melt the electric fusion member to connect the connection portion of the multiple pipe.

The fastening member is composed of an auxiliary band or a clamp surrounding the electric fusion member so that the electric fusion member is fixed by pressing the connection portion of the multiple pipe. Alternatively, the auxiliary band and the clamp may be integrally formed. That is, both the auxiliary band and the clamp can be used as the fastening member.

The inner pipe is made of a steel pipe, stainless steel pipe, copper pipe, PE pipe, or epoxy pipe, and the exterior is made of a PE pipe, HDPE pipe, LDPE pipe, etc., the heat insulating material is polyurethane foam, silica, pearlite, It consists of glass wool, rock wool, etc.

In addition, the present invention provides a method for connecting and connecting the multi-pipe and the multi-pipe including the inner pipe is supplied with the fluid and the appearance surrounding the inner pipe, connecting the inner pipe at the connection portion of the multi-pipe; Removing foreign matter from one outer surface, the outer surface of the multiple pipe and the inner surface of the electric fusion member; Mounting a support member in the space between the inner tube and the exterior at the connection portion of the multiple pipe; Surrounding the electrofusion member so as to be in contact with the support member and the exterior of the connection portion of the multiple pipe; Pressing and fixing the electric fusion member with a fastening member so that the electric fusion member can be fixed by pressing the connection portion of the multiple pipe; Supplying electricity to the electric fusion member through an electric supply member to melt the electric fusion member to connect the connecting portions of the multiple pipes; Provided is a construction method of a multi-pipe to remove the fastening member after the connection portion of the connected multi-pipe is cooled.

The foregoing objects, features, and advantages will become more apparent from the following examples taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view showing a connection structure of a multi-pipe according to an embodiment of the present invention, Figure 3 is a plan view showing a cross section of the connection structure of a multi-pipe in accordance with an embodiment of the present invention, Figure 4 is 5 is a front view showing a cross section of a connection structure of a multi-pipe according to an embodiment, Figure 5 is a side view showing a cross section of a connection structure of a multi-pipe in accordance with an embodiment of the present invention, Figure 6 is an embodiment of the present invention 7 is a perspective view showing an electric supply member in a connection structure of a multi-pipe according to FIG. 7 is a perspective view showing an auxiliary band in a connection structure of a multi-pipe according to an embodiment of the present invention, and FIG. 8 is an embodiment of the present invention. The perspective view of the clamp in the connection structure of the multiple pipe according to.

The present invention is implemented by using an electric fusion member and a support member when connecting multiple pipes and similar pipes, yet simple to completely connect the connection portion of the pipe to prevent leakage and leakage due to poor connection. In order to explain the present invention more effectively, the connection structure and the connection or construction method will be described taking an example of a double insulation tube, in particular a double insulation tube.

As shown in Figures 2 to 8, the terms of a multi-pipe (ie, a double insulating pipe; according to an embodiment of the present invention; hereinafter, "multi-pipe", "double heat pipe", "pipe" all of the convenience of description For the sake of the same, the connection structure of the multi-layer includes an inner tube 110 to which a fluid (not shown) is supplied, a heat insulating material 120 surrounding the inner pipe, and an exterior 130 surrounding the heat insulating material 120. It relates to a structure for connecting the pipe 100 and the multiple pipe 100, the support member 300 is provided in the space of the connection portion 200 of the multiple pipe (100); An electrofusion member 400 surrounding the connection part 200 of the multiple pipe; And an electric supply member 500 for supplying electricity to the electric fusion member 400, and the fastening member to closely connect the electric fusion member 400 to the connection part 200 of the multiple pipe to improve connectivity. It further includes 600. In the connection structure of the multi-pipe shown in Figures 3 and 4 in accordance with an embodiment of the present invention is a cross-sectional view showing a state in which only one support member 300 is formed, as shown in Figure 2 the plurality of support members 300 It may be formed.

Here, the inner pipe 110 is generally made of a steel pipe, a stainless pipe, a copper pipe, a PE pipe, or an epoxy pipe, but is not limited thereto, and the exterior 130 is a plastic pipe, HDPE pipe, LDPE, etc. Although it consists of a tube etc., this is not limited to the said material similarly. In addition, the insulation 120 is generally made of polyurethane foam, silica, pearlite, glass wool, rock wool, and the like. In addition, in the connection structure and method of the multiple pipe according to the present invention, the size of the multiple pipe 100 is not affected. That is, the pipe 100 of any size may be applied to the present invention.

The connection part 200 of the multiple pipe 100 and the multiple pipe 100, that is, the connection of one inner pipe 110 and the other inner pipe 110 and the connection portion of one exterior 130 and another exterior 130 In the 200, a space 210 is formed between the inner tube 110 and the exterior 130. Due to such a space, the airtightness and watertightness cannot be achieved by the conventional method at the time of connecting the multiple pipes 100, thereby reducing the reliability of the product. Accordingly, the present invention solves the above-mentioned conventional problems by installing the support member 300 in the space 210, and also electrofusion welding the problems caused by welding, which is a conventional method of connecting the multi-pipe 110. This is solved by using.

In the connection structure of the double insulation tube 100 configured as described above, the support member 300 is the inner tube 110 and the appearance at the connection portion 200 of the double insulation tube 100 as shown in Figures 2 to 4 It is provided in the space 210 between the 130 to support the electrofusion member 400.

9 is a perspective view illustrating a spacer that is a main part of a connection structure of a multi-pipe according to an embodiment of the present invention, and FIG. 10 is a perspective view illustrating a supporter that is a main part of a connection structure of a multi-pipe according to an embodiment of the present invention. Figure 11 is a perspective view showing the shape of the spacer and the supporter coupled to the main structure of the connection structure of the multi-pipe according to an embodiment of the present invention, Figure 12 is a main portion of the connection structure of the multi-pipe according to an embodiment of the present invention It is a side view which shows that the support member was integrally formed.

2 to 5, the support member 300 is in contact with the inner side of the electrofusion member (that is, the electrofusion sheet 410 to be described later) and is attached to the outside of the inner tube 110 and the electric It is sufficient to be made of a support shape capable of supporting the fusion member 400. For example, it may have a shape such as an I beam, or may be formed in another shape as long as it can be supported as described above, and various materials may be formed. Another example of the shape of the support member 300 is illustrated in FIGS. 9 to 12.

9 to 11, the support member 300 is a ring-type centering ring which is attached to the outside of the inner tube 110 at the connecting portion 200 of the pipe and has one or more protrusions 311 formed on the outer surface thereof. Spacer 310; And a bar type supporter 320 provided at an outer side of the spacer 310 and an inner side of the electrofusion sheet 410 and having a groove 321 corresponding to the protrusion 311 on an inner surface thereof. Here, the protrusion 311 is inserted into the groove 321 is provided in the space 210 of the connection portion of the pipe. The spacer 310 and the supporter 320 of the support member 300 withstand the load that the fastening member 600 is pressed from the upper portion of the electrofusion member 400 to be described later and the upper portion at the end of the electrofusion member 400. It serves to keep the bottom and bottom in close contact, enabling complete fusion. The supporting member 300 may be formed separately, but as shown in FIG. 12, the spacer 310 and the supporter 320 may be integrally formed. As shown in FIG. 2, the spacer 310 and the supporter 320 are provided in the space 210 at the connection portion of the pipe 100, and the number of the spacers 310 and the supporter 320 may be plural depending on the connection structure of the pipe. Due to such a supporting member 300, the space 210 of the connecting portion 200 of the pipe can be closed, and the connection of the pipe can be reliably increased.

13 is a perspective view showing an electrofusion member that is a main part of a connection structure of a multi-pipe according to an embodiment of the present invention. As shown in Figures 2 and 13, the electric fusion member 400 that substantially connects the pipe 100 is in contact with the supporter 320 and the exterior 130 and surrounding the connection portion 200 of the multiple pipes All. The electric fusion member 400 wraps the surface of one exterior 130 and the other exterior 130, that is, the exterior 130 in the connection portion 200 of the multiple pipe, the one end and the other end is open It includes a sheet 410 having a shape, a terminal portion 420 provided on both sides of the sheet 410, and a hot wire portion 430 provided in the sheet 410. And, the material of the electrofusion sheet 410 is made of or correspond to the material of the appearance (130).

Referring to the method of connecting the pipe using the electrofusion member (electrolysis sheet 410) in detail, the connection portion between the electrofusion sheet 410 between the exterior 130 and the exterior 130 ( Position the terminal 420 formed in the seat 410 on the upper end of the support member 300 and then fixed by pressing the electrofusion sheet with the fastening member 600. Subsequently, when electricity is supplied to the terminal portion of the electric fusion sheet 410 through the electric supply member 500, heat is generated by the resistance of the hot wire portion 430 in the sheet 410, and thus the heat wire portion 430 and the heat wire portion 430. Melting the surface of the outer surface 130 while melting the electric fusion sheet 410 in contact with each other is changed to a gel state to be bonded while being compressed. When the supplied electricity is stopped and cooled, the surfaces in contact with the hot wire portion 430 of the sheet 410 are completely fused together to form a connection of the pipe 100. In this case, the electro-fusion sheet 410 is made of the same material (for example, HDPE) or a similar material as the material of the appearance 130 to increase the fusion by the hot wire portion 430 of the sheet 410 Can be.

Here, when the connection portion 200 of the pipe is inclined rather than in a parallel state, the electrofusion sheet 410 and the appearance 130 between the surface of the outer fusion fusion sheet 410 and the fusion surface 130 By filling the same or similar material (for example, HDPE) in the form of powder or resin and filling it, even if the surface of the electric fusion sheet 410 and the exterior 130 are not in close contact as described above Can improve. That is, the powder material and the resin material correspond to the materials of the electrofusion sheet 410 and the exterior 130, so that the surface between the surface of the electrofusion sheet 410 and the exterior is melted when the surface of the electrofusion sheet 410 and the exterior are melted. Since the powder material and the resin material filled in are melted together, the adhesiveness can be improved to improve the connection of the pipe.

The electrical supply member 500 for supplying electricity to the terminal portion 420 of the electrofusion sheet 410 to connect the connection portion 200 of the pipe as an example, as shown in Figure 6 the electrofusion sheet 410 It may be made of an electric fusion machine having a cable 510 connected to the terminal portion 420 of the) or a resistor, but is not limited thereto and may be any other source as long as it can supply electricity to the electric fusion sheet 410. Can be done.

In addition, if the pressure can be fixed by surrounding the connecting portion 200 of the pipe by the electrofusion member 400 can be connected to the pipe according to the present invention. However, in order to improve the connectivity of the pipe 100, the electrofusion member 400 presses and fixes the connection part 200 of the pipe, that is, the surface of one exterior 130 and the surface of the other exterior 130. It may further include a fastening member 600 to be. As shown in FIG. 7, the fastening member 600 may be an auxiliary band 610 that surrounds the fusion sheet 410, or the clamp 620 as shown in FIG. 8 may be provided with an auxiliary band 610. By connecting to the fastening part 611 formed on one side of the electrofusion sheet 410 may be further fixed by pressure. 14 is a perspective view illustrating a form in which the clamp 620 is fastened to the auxiliary band 610. However, the shape of the fastening member 600 is not limited to the shape shown in FIG. 14, and unlike the one shown in FIG. 14, the clamp 620 is directly fastened to the electric fusion member 400 so that the electric fusion sheet 410 is provided. ) Can also be pressurized.

The present invention can be more clearly understood by explaining a method of connecting the multiple pipes constructed as described above by connecting the multiple pipes as follows.

The construction method of the multi-pipe according to the present invention is a multi-pipe including an inner pipe 110, a heat insulating material 120 surrounding the inner pipe 110, and an outer surface 130 surrounding the heat insulating material 120 is supplied with a fluid ( As a method of connecting 100 and the multiple pipe 100, the inner pipe 110 is welded or connected at the connection portion 200 of the multiple pipe. Subsequently, the outer surface of one exterior 130, which is the connection part 200 of the multiple pipe, and the surface of the other exterior 130 and the inner surface of the electrofusion member 400 (the electrofusion sheet 410) using a cloth and sandpaper, etc. Remove dirt, moisture and oil. In addition, the multi-pipe by mounting the support member 300 consisting of a spacer 310 and the supporter 320 in the space 210 between the inner pipe 110 and the exterior 130 in the connection portion 200 of the multi-pipe. Surrounding the electrofusion member 400 in contact with the support member 300, in particular the supporter 320 and the exterior 130 to the connection portion 200 of the (100). Then, the electrofusion member 400 as the fastening member 600 consisting of the auxiliary band 610 and the clamp 620 so that the electrofusion member 400 can be fixed by pressing the connection portion 200 of the multi-pipe. Press to fix. Heat is generated by the resistance of the hot wire part 430 of the electric welding sheet 410 by supplying electricity to the terminal portion 420 of the electric welding member (electric welding sheet 410) through the electric supply member 500. By melting the surface of the exterior 130 while melting the electrofusion sheet 410 by the heat, the connection portion 200 of the multiple pipe is completely integrally fused and connected. Thereafter, the connection member of the connected multiple pipe is cooled, and then the fastening member is removed. Here, since the material of the electrofusion sheet 410 and the exterior 130 is made of the same material (for example, HDPE), the surfaces of the electrofusion sheet 410 and the exterior 130 are completely integrally fused. Can be.

According to the present invention as described above, it is possible to provide an economical and reliable product because it provides a connection structure and a construction method that can completely block the inner tube 110 and the thermal insulation material 120 from the outside even by a simple installation procedure.

In addition, the present invention provides a connection structure and a construction method of a multi-pipe having excellent durability and robustness because the surface of the exterior 130 and the electrofusion sheet 410 is integrally melted and fused, thereby providing an external physical impact. It can provide a semi-permanent product life that can withstand, i.e., the same product life as a double insulation tube.

In addition, the present invention by uniformly applying the heat required for the connection of the multi-pipe 100 through electricity to reduce the carbonization phenomenon and fatigue caused by the torch flame that can occur in the past can maintain excellent airtightness and water tightness in the long term have. In addition, according to the present invention, it is possible to shorten the construction period and minimize the maintenance cost by fast and easy installation.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, the present invention is easy to use the electric fusion member and the support member when connecting multiple pipes, especially double insulation pipes and similar pipes, and leaks due to poor connection by completely sealing the connection of the pipes It is effective to prevent leakage and improve airtightness and watertightness.

In addition, the present invention by eliminating the impact of the fire and the damage of the connection portion of the pipe at the time of the conventional construction, while increasing the robustness of the double insulation tube, reducing maintenance costs, extending the product life and reliability There is also an effect that can be improved.

In addition, the present invention can be installed without cutting the inner tube even during the maintenance work of the pipe has an advantageous effect in terms of convenience and economical.

Claims (17)

A structure for connecting the multiple pipe and the multi-pipe including an inner pipe to which the fluid is supplied and the appearance surrounding the inner pipe, A support member provided in a space between an inner tube and an outer portion at a connection portion of the multiple pipe; An electric fusion member in contact with the support member and the exterior and surrounding a connection portion of the multiple pipe; And Electric supply member for supplying electricity to the electric fusion member to connect the connection portion of the multiple pipe Connection structure of the multi-pipe including. The method of claim 1, Further comprising a fastening member for the electrofusion member is fixed by pressing the connection portion of the multi-pipe. Connection structure of multiple pipes. The method of claim 1, The support member is in contact with the inside of the electric fusion member and made of a support shape capable of supporting the electric fusion member. Connection structure of multiple pipes. The method of claim 1, The support member A ring-type spacer provided at an outer side of the inner tube at a connection portion of the multiple pipe and having protrusions formed at an outer surface thereof; And a bar type supporter provided at an outer side of the spacer and an inner side of the electric fusion member and having a groove portion corresponding to the protrusion at an inner surface thereof. Connection structure of multiple pipes. The method of claim 1, The support member A ring-type spacer provided at an outer side of the inner tube at a connection portion of the multiple pipe and having protrusions formed at an outer surface thereof; And a bar type supporter which is provided on the outer side of the spacer and the inner side of the electrofusion member and has a groove portion corresponding to the protrusion on the inner surface thereof. Connection structure of multiple pipes. The method of claim 1, The electric fusion member A sheet having an open shape in which one end and the other end of the sheet are wrapped around a certain portion of one exterior and the other exterior at a connection portion of the multiple pipe; Terminal parts provided on both sides of the sheet; And a hot wire portion provided in the sheet. Connection structure of multiple pipes. The method of claim 6, The material of the electric fusion member is made to correspond to the material of the appearance Connection structure of multiple pipes. The method of claim 7, wherein When the connection portion of the multiple pipe is inclined, further comprising filling the powder or resin material corresponding to the material of the electrofusion sheet and the appearance between the electrofusion sheet and the surface of the appearance; Connection structure of multiple pipes. The method of claim 6, The electricity supply member It is composed of an electric fusion machine or a resistor for supplying electricity to both terminals of the electric fusion member to melt the electric fusion member to connect the connection portion of the multiple pipes Connection structure of multiple pipes. The method of claim 2, The fastening member is Comprising any one of the auxiliary band, a clamp, or the auxiliary band and the clamp integrally surrounding the electrofusion member so that the electrofusion member is fixed by pressing the connection portion of the multiple pipe. Connection structure of multiple pipes. The method of claim 1, The inner tube is made of steel or plastic material; The appearance is made of plastic material; The insulation is made of any one of polyurethane foam, silica, pearlite, glass wool, rock wool Connection structure of multiple pipes. Claims [1] A method of connecting and connecting a multi-pipe and a multi-pipe including an inner pipe to which a fluid is supplied and an exterior surrounding the inner pipe, Connecting an inner tube at a connection portion of the multiple pipe; Removing foreign matter from one outer surface, the outer surface of the multiple pipe and the inner surface of the electric fusion member; Mounting a support member in the space between the inner tube and the exterior at the connection portion of the multiple pipe; Surrounding the electrofusion member so as to be in contact with the support member and the exterior of the connection portion of the multiple pipe; Pressing and fixing the electric fusion member with a fastening member so that the electric fusion member can be fixed by pressing the connection portion of the multiple pipe; Supplying electricity to the electric fusion member through an electric supply member to melt the electric fusion member to connect the connecting portions of the multiple pipes; Removing the fastening member after the connection of the connected multiple pipe is cooled Construction method of multiple piping. The method of claim 12, The support member is made of a support shape that is in contact with the inner side of the electric fusion member and can support the electric fusion member, or is provided on the outer side of the inner tube at the connection portion of the multi-pipe and a ring-type spacer formed with a protrusion on the outer surface and the It is provided in the outer side of the spacer and the inner side of the electro-fusion member, and the inner surface of the bar formed in the groove portion corresponding to the projection portion, or any one of the spacer and the supporter integrally formed Construction method of multiple piping. The method of claim 13, The electro-fusion member is a sheet of an open shape, one end and the other end is connected to surround a certain portion of one appearance and the other appearance at the connection portion of the multi-pipe, the terminal portion provided on both sides of the sheet, and the heating wire portion provided in the sheet Including; The material of the electric fusion member is made to correspond to the material of the appearance Construction method of multiple piping. The method of claim 14, When the connection portion of the multiple pipe is inclined, further comprising filling the powder or resin material corresponding to the material of the electrofusion sheet and the appearance between the electrofusion sheet and the surface of the appearance; Construction method of multiple piping. The method of claim 14, The electric supply member is made of an electric fusion machine or a resistor for supplying electricity to both terminals of the electric fusion member to melt the electric fusion member to connect the connection portion of the multiple pipe; The fastening member may be formed of any one of an auxiliary band, a clamp, or one of the auxiliary band and the clamp that surrounds the electric fusion member so that the electric fusion member is fixed by pressing the connection portion of the multiple pipe. Construction method of multiple piping. The method of claim 12, The inner tube is made of steel or plastic material; The appearance is made of plastic material; The insulation is made of any one of polyurethane foam, silica, pearlite, glass wool, rock wool Construction method of multiple piping.

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